Regulation of the Phenylpropanoid Pathway: A Mechanism of Selenium Tolerance in Peanut (Arachis hypogaea L.) Seedlings

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• 作者：Guang Wang ; Liying Wu ; Hong Zhang ; Wenjia Wu ; Mengmeng Zhang ; Xiaofeng Li ; Hui Wu
• 刊名：Journal of Agricultural and Food Chemistry
• 出版年：2016
• 出版时间：May 11, 2016
• 年：2016
• 卷：64
• 期：18
• 页码：3626-3635
• 全文大小：632K
• 年卷期：0
• ISSN：1520-5118

文摘

To clarify the mechanisms of selenium (Se) tolerance in peanut seedlings, we grew peanut seedlings with sodium selenite (0, 3, and 6 mg/L), and investigated the phenylpropanoids metabolism in seedling roots. The results showed that selenite up-regulated the expression of genes and related enzyme activities involving in the phenylpropanoids biosynthesis cascade, such as phenylalanine ammonia-lyase, trans-cinnamate-4-hydroxylase, chalcone synthase, chalcone isomerase, and cinnamyl-alcohol dehydrogenase. Selenite significantly increased phenolic acids and flavonoids, which contributed to the alleviation of selenite-induced stress. Moreover, selenite enhanced the formation of endodermis in roots, which may be attributed to the up-regulation of lignin biosynthesis mediated by the selenite-induced changes of H₂O₂ and NO, which probably regulated the selenite uptake from an external medium. Accumulation of polyphenolic compounds via the phenylpropanoid pathway may be one of the mechanisms of the increasing selenite tolerance in plants, by which peanut seedlings survived in seleniferous soil, accompanied by accumulation of Se.